POWER WEAVING LOOM

METIER A TISSER MECANIQUE

English Abstract

A power weaving loom has a shed (6) made of warp
threads (6) in which a reed (14) is guided back and forth.
Weft thread insertion means (26), for example shaped as an
insertion band (28) guided on guiding elements (24) linked to
a reed lever (23) of the reed (14), are used to insert the weft
thread. The guiding elements (24) are coplanar to the
mid-plane of a corresponding reed tooth (18a), said mid-plane
extending in the direction of motion of a reed tooth (18a). A
deflecting member (36) that extends on both sides of the
mid-plane in the direction of the weft thread for reliably guiding
a warp thread past the guiding element (24) and avoiding
interlocking is arranged between the reed tooth (36) and the
guiding element (24). Parallel yarns may thus be used in such
a power weaving loom even in a high performance range.

French Abstract

Ce métier à tisser comprend un pas de chaîne (4) formé de fils de chaîne (6) dans lequel est guidé un peigne (14) oscillant. Des éléments d'insertion (26) du fil de trame, par exemple sous forme d'une bande d'insertion (28) guidée sur des éléments de guidage (24) reliés à un levier (23) du peigne, servent à insérer le fil de trame. Les éléments de guidage (24) se situent sur le même plan que le plan médian dans le sens de déplacement d'une dent (18a) correspondante du peigne. Un organe déflecteur (36) qui s'étend des deux côtés du plan médian dans la direction du fil de trame est monté entre la dent (18a) du peigne et l'élément de guidage (24) afin de guider de manière sûre le fil de chaîne le long de l'élément de guidage (24) et éviter des accrochages. On peut ainsi utiliser des fils parallèles dans un tel métier à tisser même dans une plage de hautes performances.

Claims

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Claims:

1. Weaving machine comprising a device (2) for forming a
shed (4) from warp threads (6), weft thread insertion means
(26) for the insertion of a weft thread into the shed (4)
in accordance with a weft thread pattern, guide elements
(24, 54, 62, 62a, 62b, 72, 82) for the weft thread
insertion means (26), which guide elements (24, 54, 62,
62a, 62b, 72, 82) are displaceable into and out of the shed
(4) from below the shed, and a weaving reed containing
weaving reed dents (18, 18a, 18b, 56, 68, 80, 84) for
beating up an inserted weft thread at the knock-off (12) of
a woven fabric (16) to be produced, wherein one of the
guide elements (24, 54, 62, 62a, 62b, 72, 82) is associated
with each corresponding weaving reed dent (18, 18a, 18b,
56, 68, 80, 84) after two or more weaving reed dent pitches
(T) so as to extend in the same plane as the center plane
(M) of the weaving reed dent (18, 18a, 18b, 56, 68, 80,
84), which center plane (M) extends in a movement direction
of the guide element, wherein a deflecting member (36, 36a,
36b, 58, 70, 78, 86) for the warp thread (6) widens out on
either side of the center plane (M) in the direction (38)
of the weft thread pattern and is formed integral with the



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weaving reed dent, is arranged between the weaving reed
dent and the guide elements (24, 54, 62, 62a, 62b, 72, 82),
wherein the deflecting member extends, starting from a
bottom, to below the knock-off line (40) of the weaving
reed (14, 60).

2. Weaving machine according to claim 1, wherein the
deflecting member (36, 36a, 36b, 58, 70, 78, 86) extends at
least to below an upper side of the guide element (24, 54,
62, 62a, 62b, 72, 82) and to below the shed (4) when the
weaving reed (14, 60) is located in the position farthest
from the knock-off (12) of the woven fabric (16).

3. Weaving machine according to claim 1, wherein the
greatest width (B) of the deflecting member (36, 36a, 36b,
58, 70, 78, 86) corresponds at most to ten times the pitch
(T) of the weaving reed (14, 60).

4. Weaving machine according to claim 1, wherein the
length (L) of the deflecting member (36, 36a, 36b, 58, 70,
78, 86) in the movement direction of the weaving reed (14,


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60) amounts to at least half of the thickness (d) of the
weaving reed dent (18, 18a, 18b, 56, 68, 80, 84).

5. Weaving machine according to claim 1, wherein the
deflecting member (36, 36a, 36b, 58, 70, 78, 86) has a
reduced diameter toward the knock-off line (40) of the
weaving reed (14, 60).

6. Weaving machine according to claim 1, wherein the
guide element (24, 72) is arranged independently from the
weaving reed dent (18, 18a, 18b, 80).

7. Weaving machine according to claim 1, wherein the
deflecting member (36, 36a, 36b, 58, 86) is constructed as
a thickening (48) of the weaving reed dent (18, 18a, 18b,
56, 84).

8. Weaving machine according to claim 1, wherein the
weaving reed (14) is formed of parts (46, 50) which are
arranged in a mirror-inverted manner with respect to the
center plane (M) which parts have angled edge areas (5) for
forming the deflecting member (36b).



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9. Weaving machine according to claim 8, wherein the
weaving reed is formed of sheet-metal parts.

10. Weaving machine according to claim 1, wherein said
guide elements include at least one integrated guide
element and wherein at least one weaving reed dent (68, 84)
is associated with at least one integrated guide element
(62a, 82), said at least one weaving reed dent being
connected with the weaving reed (60).

11. Weaving machine according to claim 10, wherein said
guide elements include at least one guide element (62)
being constructed in two parts, said two guide element
parts including a first guide element part (62a) being
arranged at the weaving reed dent (68) and a second guide
element part (62b) being arranged at a separate carrier
(66).

12. Weaving machine according to claim 1, wherein said
guide elements include at least one integrated guide
element and wherein at least one weaving reed dent (56) is
associated with at least one integrated guide element (54),




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said at least one weaving reed dent being unconnected with
the weaving reed (14) and connected with a device (20)
supporting at least one integrated guide element (54).

Description

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POWER WEAVING LOOM
Technical Field
The invention is directed to a weaving machine with a
device for forming a shed from warp threads with weft thread
insertion means for the insertion of a weft thread into the
shed, with guide elements for the weft thread insertion means,
which guide elements can move into and out of the shed from
below, and with a weaving reed containing weaving reed dents for
beating up an inserted weft thread at the knock-off of a woven
fabric to be produced, characterized in that a guide element is
associated with each corresponding weaving reed dent after two
or more weaving reed dent pitches (T) so as to extend in the
same plane as the center plane (M) of the weaving reed dent,
which center plane (M) extends in the movement direction,
wherein a deflecting member for the warp thread, which
deflecting member widens out on either side of the center plane
(M) in the direction of the weft thread pattern and is formed
integral with the weaving reed dent, is arranged between the
weaving reed dent and the guide elements, wherein the deflecting
member extends, starting from the bottom, to below the knock-off
line of the weaving reed.

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The weft thread insertion means feature is understood and
referred to herein in its broadest meaning, e.g., such means as
projectiles, grippers, shuttle, air jet or other media for
insertion of a weft thread into a shed formed of warp threads. A
great number of such weft thread insertion means are likewise
known.
Prior Art
Weaving machines of the type mentioned above are often
high-power weaving machines in which the weft thread insertion
means move into and out of the shed. Guide elements are required
for this purpose, wherein difficulties arise in the processing
of warp threads formed of parallel yarns. Parallel yarns are
formed of a plurality of (at least two) individual synthetic
fibrils or fibers which extend parallel to one another with
practically no twisting. To prevent the fibrils of these threads
from coming apart, they are glued together by paste or size or
are connected portion-by-portion by an air interlacing or
intermingling process. Yarns that have been produced by air
interlacing are

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called air-interlaced or air-entangled yarn. There is a tendency
for the warp threads made from such parallel yarns to split up at
the guide elements, resulting in fibril breakage and/or thread
breakage. This drastically reduces the efficiency of such high-
power weaving machines, so that, ultimately, rather than such
parallel yarns,

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only expensive twisted yarns can be used in these machines. In
order to remedy this somewhat, such parallel yarns are
additionally provided with a paste or size. Apart from the fact
that such sizing processes are expensive, the size causes very
extensive soiling of the weaving machines. Further, the size
must be washed out during further processing of the woven fabric.
The washed out size must be disposed of in an environmentally
sound manner by a very cost-intensive process.
A shuttleless weaving machine is known from FR-A-2 547 602,
wherein, in order to avoid the above-mentioned disadvantages,
guide elements are formed at every reed dent to form an insertion
channel in order that a weft thread can be introduced by means of
air jets. However, this cannot prevent the risk of warp threads
of untwisted yarn remaining suspended at the blowing nozzles or
air jet nozzles, because these nozzles are wider than the spacing
between the reed dents and accordingly than the spacing between
the warp threads, and the latter are forced apart by the air jet
nozzles during the swiveling of the weaving reed. Since the
thickness of the guide elements only corresponds to the thickness
of the reed dent, the guide elements are very thin and do-not
have sufficient stability and can bend, thereby increasing the
risk that parts of the warp thread will remain suspended. They
are not at all suitable for guiding the weft insertion members.
In order to achieve adequate stability, the reed dents, and
accordingly the guide elements, would have to be thicker, so that
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only a very coarse pitch of the weaving reed dents would be
possible and only a correspondingly coarse woven fabric could be
manufactured.
DE-U-91 00 753 discloses a weaving machine in which the
weaving reed is provided with a shuttle guide whose going-parts
having sliding elements which extend in the direction of the warp
threads and engage between the warp threads. The sliding
elements are wider than the warp thread spacing. In front of or
behind every sliding element, there is arranged a displacing
element which has at least the same width as the sliding element,
but has a greater height than the sliding element and forms a
dent bar or gap between the warp threads. The displacing element
forms a point at the free end. The displacing element must force
the warp threads apart with every change of shed to form a gap.
This shuttle guide can not overcome the problems described above
because it is suitable only for high-quality twisted yarns, but
not for parallel yarns which would be damaged or destroyed at the
pointed displacing element.
Description of the Invention
The object of the invention is to develop a weaving machine
of the type mentioned above in such a way that parallel yarns can
also be processed, even if they are not provided with size,
wherein the disadvantages indicated above are avoided.
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In one aspect, the present invention resides in the weaving
machine comprising a device for forming a shed from warp
threads, weft thread insertion means for the insertion of a weft
thread into the shed in accordance with a weft thread pattern,
guide elements for the weft thread insertion means, which guide
elements are displaceable into and out of the shed from below
the shed, and a weaving reed containing weaving reed dents for
beating up an inserted weft thread at the knock-off of a woven
fabric to be produced, wherein one of the guide elements is
associated with each corresponding weaving reed dent after two
or more weaving reed dent pitches so as to extend in the same
plane as the center plane of the weaving reed dent, which center
plane extends in a movement direction of the guide element,
wherein a deflecting member for the warp thread widens out on
either side of the center plane in the direction of the weft
thread pattern and is formed integral with the weaving reed
dent, is arranged between the weaving reed dent and the guide
elements, wherein the deflecting member extends, starting from a
bottom, to below the knock-off line of the weaving reed.
Due to the fact that the deflecting member is formed
integral with the weaving reed dent, the deflection of the warp
threads required for the guide element for the weft thread

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insertion means, which guide element follows the weaving reed,
is effected directly at the weaving reed, so that damage to the
warp threads or destruction of the warp threads is prevented.
The arrangement of guide elements, and accordingly also
deflecting members, after two or more weaving reed dent
divisions ensures a sufficient lateral spacing such that the
guide elements for different weft thread insertion systems are
constructed so as to be sufficiently stable and/or in order to
select a fine weaving reed dent pitch. Accordingly, it is
possible also to process parallel yarns in modern high-power
weaving machines even when these yarns are not provided with
size. This means that parallel yarns which are inexpensive to
produce can be processed and this can be done on fast high-power
weaving machines. Moreover, it is no longer necessary to
subsequently wash out size which is now absent. The cost
advantages resulting from this are obvious.
The deflecting member preferably extends, at least to below
the upper side of the guide element, but preferably until below
the shed when the weaving reed is located

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in the position furthest from the knock-off of the woven fabric.
In a further aspect, the present invention resides in the
weaving machine as described above, characterized in that the
greatest width (B) of the deflecting member corresponds at most
to ten times the pitch (T) of the weaving reed.
In another aspect, the present invention resides in the
weaving machine described above, characterized in that the
length (L) of the deflecting member in the movement direction of
the weaving reed amounts to at least half of the thickness (d)
of the weaving reed dent.
The deflection of the warp threads is improved when the
deflecting member of the weaving machine is constructed so as to
be reduced in diameter toward the knock-off line of the weaving
reed.
In another aspect, the present invention resides in a
weaving machine wherein the guide element is advantageously
arranged independent from the weaving reed dent. A construction
of this kind can be effected by constructing the deflecting
member as a thickening of the weaving reed dent. A simpler and
easier construction is achieved when the weaving reed is formed
of parts which are arranged in a mirror-inverted manner with

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respect to the center plane (M), preferably sheet-metal parts
which have angled areas for forming the deflecting member.
A weaving reed dent having the integrated guide element can
be connected directly with the weaving reed. In many cases,
however, a construction wherein the weaving reed dent having the
integrated guide element is not connected with the weaving reed
but preferably connected with a device. Supporting the guide
element can also be advantageous. However, it is also possible
for the guide element to be constructed in two parts with one
guide element part to be arranged at the weaving reed dent and
the other to be arranged at a separate carrier.
Brief Description of the Drawings
Embodiment examples of the weaving machine according to the
invention are explained more fully hereinafter with reference to
schematic drawings, wherein only those parts of the shed area of
the weaving machine, known per se, which are relevant for the
present configuration according to the invention are shown.

CA 02218494 1997-10-17
Figure 1 is a side view of the weaving area of a first weaving
machine;
Figure 2 shows the weaving reed with deflecting members in
section II-II of Figure 1 in enlarged scale;
Figure 3 shows the weaving reed with deflecting members and guide
element in section III-III of Figure 1 in enlarged scale;
Figure 4 shows a side view of the weaving area of a second
weaving machine;
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Figure 5 shows the weaving reed in section V-V of Figure 4 in
enlarged scale;
Figure 6 shows the weaving reed with deflecting members in
section VI-VI of Figure 4 in enlarged scale;
Figure 7 shows the weaving reed with deflecting member and with
guide elements in section VII-VII of Figure 4 in enlarged scale;
Figure 8 shows a side view of the weaving area of a third weaving
machine;
Figure 9 shows a side view of the weaving area of a fourth
weaving machine;
Figure 10 shows the weaving reed with deflecting members and with
guide elements in section X-X of Figure 9 in enlarged scale;
Figure 11 shows the weaving reed with deflecting members and with
guide elements in section XI-XI of Figure 9 in enlarged sca-le;
Figure 12 shows a side view of the weaving area of a fifth
weaving machine;
Figure 13 shows the weaving reed with deflecting members in
section XIII-XIII of Figure 12 in enlarged scale; and

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Figure 14 shows the weaving reed with deflecting members and with
guide elements in section XIV-XIV of Figure 12 in enlarged scale.
Modes for Carrying out the Invention and Commercial Applicability
Identical structural component parts are provided with
identical reference numbers in the following embodiment examples
and Figures.
Figure 1 shows the weaving area of a first weaving machine
which has a device 2 for forming a shed 4 from warp threads 6.
All that is shown of the device 2 for forming the shed are
heddles 8 which move the warp thread up and down and accordingly
open, close and change the shed. The warp threads 6 are made,
for example, from parallel yarns which are produced by the air-
interlacing process and contain interlacing points as knots 10.
The warp threads 6 are guided together at the knock-off 12 at
which a weft thread, not shown, which is inserted into the shed 4
by means of a weaving reed 14, is beaten up and thus serves to
produce the woven fabric 16. The weaving reed 14 comprises
individual weaving reed dents 18 which are arranged in a weaving
reed pitch T in a lower carrier 20 and are connected with one
another at the upper end by a binder rod 22. The weaving reed is
securely clamped in at the reed lever 23. Further, guide
elements 24 are arranged at the reed lever 23 and serve to guide
the weft thread insertion means 26 which, in the present case,

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have an insertion band 28 which is guided between two groove-like
recesses 30 in teeth 32, 34 of the guide element 24. The guide
element 24 is arranged so as to extend in the same plane as the
center plane M of an associated weaving reed dent 18a, which
center plane M extends in the movement direction, as is shown
especially in Figure 3.

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Between the weaving reed dent 18a and the guide element 24, there
is a deflecting member 16 which is formed integral with the
weaving reed dent 18a. The deflecting member for the warp
threads 6 widens out on either side of the center plane M in the
direction 38 of the weft thread pattern, so that it forms,
starting from the weaving reed dent 18a, a wedge-shaped guide for
the weft threads and moves the latter laterally past the guide
elements 24 without there being a risk that the warp threads
remain suspended at the guide elements 24.
The deflecting member 36 begins below a knock-off line 40 of
the weaving reed 14 and extends at least over the upper side of
the associated guide element 24, but preferably farther down
until it projects from the shed 4 as is shown in Figure 1. At
the top and bottom, the deflecting member 36 is provided with
portions 42, 44 which are tapered or reduced in diameter to
facilitate the deflection of the warp threads when moving into
and out of the shed. In the knock-off position of the weaving
reed shown in dash-dot lines in Figure 1, the deflecting member
lies below the knock-off.
The deflecting member is preferably so constructed that the
greatest width B of the deflecting member corresponds at most to
ten times the pitch T of the weaving reed dent. The length L of
the deflecting member in the movement direction of the weaving
reed 14 is at least half of the thickness d of the weaving reed
dent 18a. In the shown example, the spacing A between adjacent
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deflecting members 36 corresponds to twice the pitch T of the
weaving reed dents 18.
Further constructions of the deflecting member 36 are shown
in Figure 3. Accordingly, the weaving reed dent 18b is formed of
two parts 46 which are arranged along the center plane M in a
mirror-inverted manner and have thickened portions 48 forming the
deflecting member 36a. The weaving reed dent 18b is likewise
divided along the center plane
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M and constructed in a mirror-inverted manner. The individual
parts 50 are formed of sheet metal and the deflecting members 36b
are formed by angled edge areas 52.
Figures 4 to 7 show the weaving area of another weaving
machine which is identical to the weaving machine in Figures 1 to
3 with respect to the weft thread insertion means 36. However,
in this case, the area between the weaving reed dent 56 and the
guide element 54 is constructed as a deflecting member 58.
Further, the weaving reed dent 56 is not connected with the
weaving reed 60, but rather is carried by the guide element 54
and fastened at the reed lever 23.
Figure 8 shows a mixture of the embodiment examples of
Figures 1 to 3 and 4 to 7, wherein the guide element 62 is
divided into guide element parts 62a, 62b. The guide element
part 62b is connected, via a screw 64, with a separate carrier 66
which is, in turn, fastened to the reed lever 23 of the weaving
reed. The other guide element part 62a forms an integral
component part of the weaving reed dent 68, wherein the
deflecting member 70 is again arranged between the guide element
part 62a and the weaving reed dent 68.
Figures 9 to 11 show the weaving area of another weaving
machine, wherein the guide elements 72 are so constructed that
they use an air jet 74 as weft thread insertion means, this air
jet 74 being blown into the guide elements 72 from stepped
nozzles 76. Deflecting members 78 associated with the guide
elements 72 are formed integral with the associated weaving reed

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dent 80, namely in a manner analogous to the deflecting member
36b shown in Figure 3.
Figures 12 to 14 show the weaving area of another weaving
machine which is constructed in a manner similar to that shown in
Figures 9 to 1l; however, in Figures 12 to 14, the guide elements
82 are formed integral with a weaving reed dent 84 and the
deflecting members 86 are formed between the weaving reed dent 84
and the guide element 82. The stepped nozzles 88 serving to blow
in air are fastened to a carrier 90 which is fastened in turn to
the reed lever 23 of the weaving reed 14. In the shown example,
the spacing A1 between adjacent guide elements 82 and the
corresponding weaving reed dents 84 corresponds to three times
the pitch T of the weaving reed dents 84 of the weaving reed 14.

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A spacing
B width
d thickness
L length
M center plane
T pitch
2 device
4 shed
6 warp thread
8 heddle
knots
12 knock-off
14 weaving reed
16 woven fabric
18 weaving reed dent
18a weaving reed dent
18b weaving reed dent
carrier
22 binder rod
23 reed lever
24 guide means
26 weft thread insertion means
28 insertion band
recess

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32 tooth
34 tooth
36 deflecting member
36a deflecting member
36b deflecting member
38 direction
40 knock-off line
42 reduced-diameter portion
44 reduced-diameter portion
46 part
48 thickened portion
50 part
52 edge area
54 guide element
56 weaving reed dent
58 deflecting member
60 weaving reed
62 guide element
62a guide element
62b guide element
64 screw
66 carrier
68 weaving reed dent
70 deflecting member
72 guide element
74 air jet

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76 stepped nozzle


78 deflecting member


80 weaving reed dent


82 guide element


84 weaving reed dent


86 deflecting member


88 stepped nozzle


90 carrier

Representative Drawing